Used primarily in solid-phase peptide synthesis, this compound serves as a protected amino acid derivative that enables selective incorporation of D-aspartic acid into peptide chains. The Fmoc group provides temporary protection for the alpha-amino group, allowing stepwise assembly of peptides under mild basic conditions. The 9-fluorenylmethyl ester protection on the aspartic acid side chain prevents unwanted side reactions during coupling steps, ensuring high fidelity in peptide sequence construction. It is especially valuable in synthesizing complex peptides with defined stereochemistry, including those used in pharmaceutical research and development. Its stability and orthogonal deprotection profile make it compatible with a wide range of other protected amino acids, supporting the synthesis of structurally diverse and biologically active peptides.